Abstract

We offer a general treatment of electromagnetically-induced transparency (EIT) in a four-level system consisting of a ladder-type system and a V-type system through which a two-coupling light generates two pairs of dressed states that help to improve susceptibility so that a much slower light speed can be achieved than with the standard V-type system. In particular, a method is shown to realize the transition of light propagation from slower-than-c to faster-c by means of the pump between two lower states.

© 2010 Optical Society of America

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